Question

what is atomic no?
what is mass no?​

Answer 1

Answer:

atomic no is atomic number

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table is called atomic number.

eg:-, in a sodium atom, there are 11 electrons and 11 protons. Thus the atomic number of Na atom = number of electrons = number of protons = 11.

mass no is mass number

the total number of protons and neutrons in a nucleus ia called mass number

eg:- uranium-235

Explanation:

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Answer 2

atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

mass

Mass number: It is the sum of the number of neutrons and the number of protons. For example, the atomic number of Lithium is 4 which is equal to the number of protons, the number of neutrons of magnesium is 4. The mass number is equal to 8(4+4).